1950 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
particles are getting trapped with magnetite and eventually
iron grade falls.
Effect of High-Intensity Magnetic Separation
The non-mag portion obtained from LIMS was subjected
to high-intensity magnetic separation with a target to
achieve more iron content and separate the remaining car-
bon in the non-mag portion .Figure 15–17 represent the
effect of magnetic field on magnetic concentrate yield with
respect to bulk feed, iron grade and fixed carbon in the
sample for three different feed sizes. It indicates that as the
intensity increases, the magnetic concentrate yield increases
while the iron grade is sacrificed. Gangue particles also
get entrapped at high intensities, resulting in a decrease in
iron grade. However the carbonaceous substance remains
more or less same throughout all intensities and is lower
in case of –25 and –45 micron feed size. in the case of –25
microns, with an increase in the intensities from 2500 to
Figure 13. Effect of collector dosage on floatation froth charcteristics
2.91
5.7
6.5
62.5
61.4 60.9
22.04 20.72
16.96
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
-25 micron -45 micron -75 micron
LIMS Mag Yield wrt feed %
Yield wrt feed %Fe(T) FeO
Figure 14. Effect of feed size on LIMS performance
particles are getting trapped with magnetite and eventually
iron grade falls.
Effect of High-Intensity Magnetic Separation
The non-mag portion obtained from LIMS was subjected
to high-intensity magnetic separation with a target to
achieve more iron content and separate the remaining car-
bon in the non-mag portion .Figure 15–17 represent the
effect of magnetic field on magnetic concentrate yield with
respect to bulk feed, iron grade and fixed carbon in the
sample for three different feed sizes. It indicates that as the
intensity increases, the magnetic concentrate yield increases
while the iron grade is sacrificed. Gangue particles also
get entrapped at high intensities, resulting in a decrease in
iron grade. However the carbonaceous substance remains
more or less same throughout all intensities and is lower
in case of –25 and –45 micron feed size. in the case of –25
microns, with an increase in the intensities from 2500 to
Figure 13. Effect of collector dosage on floatation froth charcteristics
2.91
5.7
6.5
62.5
61.4 60.9
22.04 20.72
16.96
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
-25 micron -45 micron -75 micron
LIMS Mag Yield wrt feed %
Yield wrt feed %Fe(T) FeO
Figure 14. Effect of feed size on LIMS performance